What is the difference between hard rail and linear rail in precision parts processing

The hard rail refers to the casting that integrates the guide rail and the base. When processing precision parts, the guide rail is processed according to the casting. That is, the shape of the guide rail is cast on the bed, and then processed by quenching and grinding. The bed and the guide rail are not necessarily integrated. For example, nailing steel rails to the bed after processing. Linear guides for machine tools that use hard rails usually refer to rolling guides, which are the kind used in linear modules, which are now often used in the machine tool industry. We usually refer to these types of components as “linear guides”.

 

Advantages, disadvantages and applications of hard rails in precision parts processing: hard rails have large sliding contact surfaces, good rigidity, strong shock resistance, strong load-bearing capacity, and are suitable for heavy-duty cutting. The hard track is dry friction. Due to the large contact surface, the frictional resistance is also large, and the moving speed cannot be too fast. At the same time, crawling is prone to occur, and gaps on the moving surface can cause machining errors. Maintaining machine tool tracks is a top priority. Once the track lubrication is insufficient, it will cause the track to burn or wear, which is critical to the accuracy of the machine tool. The application of hard rails is suitable for heavy cutting, large molds, high hardness workpieces, and workpieces with general accuracy requirements.

In precision parts processing, the advantages and disadvantages of linear rails and their applications. Nowadays, many machine tools run very fast, especially at idling speeds. This is largely due to the linear guide. Linear guide rails can be pre-tensioned to achieve a high-precision zero gap between the guide rails. In terms of service life, linear guides are much higher than hard rails. The cutting force of linear guides is less than that of hard guides. Only used for hard tracks. In fact, the linear guides of many machine tools have greatly improved their load-bearing capacity. The application of linear guide is suitable for high-speed machines, high-speed cutting, suitable for processing products and small precision molds.

Today, more precise machining centers use linear guides.

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